# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from typing import Any

from adk_triaging_agent.settings import GITHUB_BASE_URL
from adk_triaging_agent.settings import IS_INTERACTIVE
from adk_triaging_agent.settings import OWNER
from adk_triaging_agent.settings import REPO
from adk_triaging_agent.utils import error_response
from adk_triaging_agent.utils import get_request
from adk_triaging_agent.utils import patch_request
from adk_triaging_agent.utils import post_request
from google.adk.agents.llm_agent import Agent
import requests

LABEL_TO_OWNER = {
    "a2a": "seanzhou1023",
    "agent engine": "yeesian",
    "auth": "seanzhou1023",
    "bq": "shobsi",
    "core": "Jacksunwei",
    "documentation": "joefernandez",
    "eval": "ankursharmas",
    "live": "seanzhou1023",
    "mcp": "seanzhou1023",
    "models": "xuanyang15",
    "services": "DeanChensj",
    "tools": "xuanyang15",
    "tracing": "jawoszek",
    "web": "wyf7107",
    "workflow": "DeanChensj",
}

LABEL_GUIDELINES = """
      Label rubric and disambiguation rules:
      - "documentation": Tutorials, README content, reference docs, or samples.
      - "services": Session and memory services, persistence layers, or storage
        integrations.
      - "web": ADK web UI, FastAPI server, dashboards, or browser-based flows.
      - "question": Usage questions without a reproducible problem.
      - "tools": Built-in tools (e.g., SQL utils, code execution) or tool APIs.
      - "mcp": Model Context Protocol features. Apply both "mcp" and "tools".
      - "eval": Evaluation framework, test harnesses, scoring, or datasets.
      - "live": Streaming, bidi, audio, or Gemini Live configuration.
      - "models": Non-Gemini model adapters (LiteLLM, Ollama, OpenAI, etc.).
      - "tracing": Telemetry, observability, structured logs, or spans.
      - "core": Core ADK runtime (Agent definitions, Runner, planners,
        thinking config, CLI commands, GlobalInstructionPlugin, CPU usage, or
        general orchestration). Default to "core" when the topic is about ADK
        behavior and no other label is a better fit.
      - "agent engine": Vertex AI Agent Engine deployment or sandbox topics
        only (e.g., `.agent_engine_config.json`, `ae_ignore`, Agent Engine
        sandbox, `agent_engine_id`). If the issue does not explicitly mention
        Agent Engine concepts, do not use this label—choose "core" instead.
      - "a2a": Agent-to-agent workflows, coordination logic, or A2A protocol.
      - "bq": BigQuery integration or general issues related to BigQuery.
      - "workflow": Workflow agents and workflow execution.
      - "auth": Authentication or authorization issues.

      When unsure between labels, prefer the most specific match. If a label
      cannot be assigned confidently, do not call the labeling tool.
"""

APPROVAL_INSTRUCTION = (
    "Do not ask for user approval for labeling! If you can't find appropriate"
    " labels for the issue, do not label it."
)
if IS_INTERACTIVE:
  APPROVAL_INSTRUCTION = "Only label them when the user approves the labeling!"


def list_untriaged_issues(issue_count: int) -> dict[str, Any]:
  """List open issues that need triaging.

  Returns issues that need any of the following actions:
  1. Issues without component labels (need labeling + type setting)
  2. Issues with 'planned' label but no assignee (need owner assignment)

  Args:
    issue_count: number of issues to return

  Returns:
    The status of this request, with a list of issues when successful.
    Each issue includes flags indicating what actions are needed.
  """
  url = f"{GITHUB_BASE_URL}/search/issues"
  query = f"repo:{OWNER}/{REPO} is:open is:issue"
  params = {
      "q": query,
      "sort": "created",
      "order": "desc",
      "per_page": 100,  # Fetch more to filter
      "page": 1,
  }

  try:
    response = get_request(url, params)
  except requests.exceptions.RequestException as e:
    return error_response(f"Error: {e}")
  issues = response.get("items", [])

  component_labels = set(LABEL_TO_OWNER.keys())
  untriaged_issues = []
  for issue in issues:
    issue_labels = {label["name"] for label in issue.get("labels", [])}
    assignees = issue.get("assignees", [])

    existing_component_labels = issue_labels & component_labels
    has_component = bool(existing_component_labels)
    has_planned = "planned" in issue_labels

    # Determine what actions are needed
    needs_component_label = not has_component
    needs_owner = has_planned and not assignees

    # Include issue if it needs any action
    if needs_component_label or needs_owner:
      issue["has_planned_label"] = has_planned
      issue["has_component_label"] = has_component
      issue["existing_component_label"] = (
          list(existing_component_labels)[0]
          if existing_component_labels
          else None
      )
      issue["needs_component_label"] = needs_component_label
      issue["needs_owner"] = needs_owner
      untriaged_issues.append(issue)
      if len(untriaged_issues) >= issue_count:
        break
  return {"status": "success", "issues": untriaged_issues}


def add_label_to_issue(issue_number: int, label: str) -> dict[str, Any]:
  """Add the specified component label to the given issue number.

  Args:
    issue_number: issue number of the GitHub issue.
    label: label to assign

  Returns:
    The status of this request, with the applied label when successful.
  """
  print(f"Attempting to add label '{label}' to issue #{issue_number}")
  if label not in LABEL_TO_OWNER:
    return error_response(
        f"Error: Label '{label}' is not an allowed label. Will not apply."
    )

  label_url = (
      f"{GITHUB_BASE_URL}/repos/{OWNER}/{REPO}/issues/{issue_number}/labels"
  )
  label_payload = [label]

  try:
    response = post_request(label_url, label_payload)
  except requests.exceptions.RequestException as e:
    return error_response(f"Error: {e}")

  return {
      "status": "success",
      "message": response,
      "applied_label": label,
  }


def add_owner_to_issue(issue_number: int, label: str) -> dict[str, Any]:
  """Assign an owner to the issue based on the component label.

  This should only be called for issues that have the 'planned' label.

  Args:
    issue_number: issue number of the GitHub issue.
    label: component label that determines the owner to assign

  Returns:
    The status of this request, with the assigned owner when successful.
  """
  print(
      f"Attempting to assign owner for label '{label}' to issue #{issue_number}"
  )
  if label not in LABEL_TO_OWNER:
    return error_response(
        f"Error: Label '{label}' is not a valid component label."
    )

  owner = LABEL_TO_OWNER.get(label, None)
  if not owner:
    return {
        "status": "warning",
        "message": f"Label '{label}' does not have an owner. Will not assign.",
    }

  assignee_url = (
      f"{GITHUB_BASE_URL}/repos/{OWNER}/{REPO}/issues/{issue_number}/assignees"
  )
  assignee_payload = {"assignees": [owner]}

  try:
    response = post_request(assignee_url, assignee_payload)
  except requests.exceptions.RequestException as e:
    return error_response(f"Error: {e}")

  return {
      "status": "success",
      "message": response,
      "assigned_owner": owner,
  }


def change_issue_type(issue_number: int, issue_type: str) -> dict[str, Any]:
  """Change the issue type of the given issue number.

  Args:
    issue_number: issue number of the GitHub issue, in string format.
    issue_type: issue type to assign

  Returns:
    The the status of this request, with the applied issue type when successful.
  """
  print(
      f"Attempting to change issue type '{issue_type}' to issue #{issue_number}"
  )
  url = f"{GITHUB_BASE_URL}/repos/{OWNER}/{REPO}/issues/{issue_number}"
  payload = {"type": issue_type}

  try:
    response = patch_request(url, payload)
  except requests.exceptions.RequestException as e:
    return error_response(f"Error: {e}")

  return {"status": "success", "message": response, "issue_type": issue_type}


root_agent = Agent(
    model="gemini-2.5-pro",
    name="adk_triaging_assistant",
    description="Triage ADK issues.",
    instruction=f"""
      You are a triaging bot for the GitHub {REPO} repo with the owner {OWNER}. You will help get issues, and recommend a label.
      IMPORTANT: {APPROVAL_INSTRUCTION}

      {LABEL_GUIDELINES}

      ## Triaging Workflow

      Each issue will have flags indicating what actions are needed:
      - `needs_component_label`: true if the issue needs a component label
      - `needs_owner`: true if the issue needs an owner assigned (has 'planned' label but no assignee)

      For each issue, perform ONLY the required actions based on the flags:

      1. **If `needs_component_label` is true**:
         - Use `add_label_to_issue` to add the appropriate component label
         - Use `change_issue_type` to set the issue type:
           - Bug report → "Bug"
           - Feature request → "Feature"
           - Otherwise → do not change the issue type

      2. **If `needs_owner` is true**:
         - Use `add_owner_to_issue` to assign an owner based on the component label
         - Note: If the issue already has a component label (`has_component_label: true`), use that existing label to determine the owner

      Do NOT add a component label if `needs_component_label` is false.
      Do NOT assign an owner if `needs_owner` is false.

      Response quality requirements:
      - Summarize the issue in your own words without leaving template
        placeholders (never output text like "[fill in later]").
      - Justify the chosen label with a short explanation referencing the issue
        details.
      - Mention the assigned owner only when you actually assign one (i.e., when
        the issue has the 'planned' label).
      - If no label is applied, clearly state why.

      Present the following in an easy to read format highlighting issue number and your label.
      - the issue summary in a few sentence
      - your label recommendation and justification
      - the owner of the label if you assign the issue to an owner (only for planned issues)
    """,
    tools=[
        list_untriaged_issues,
        add_label_to_issue,
        add_owner_to_issue,
        change_issue_type,
    ],
)
